JP2575731Y2 - Filter material - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter material.
Specifically, the pleats formed by pleating
The present invention relates to a filter material in which the distance between pleats is maintained due to physical obstacles .

[0002]

2. Description of the Related Art Hitherto, as a filter material, a material in which pleats are formed to increase the surface area to enhance the filter function has been used in many cases.

For example, as shown in FIG. 6, a filter paper is pleated by providing linear pleated fold lines 2 at equal intervals. In this filter material 1, when folded along the pleated fold line 1 and attached to the filter,
The cross section of the filter material 1 was corrugated, and the surface area on the upstream side was significantly larger than that having a flat filtration surface without pleating, and the filter function was dramatically improved.

However, in this filter material,
Adjacent pleats come into close contact with each other due to the pressure of the fluid to be filtered, and the surface area of the filter material is reduced accordingly, resulting in a decrease in filter function.

[0005] In order to solve such a problem, there has been proposed a filter material in which a spacer for maintaining an interval between pleats is interposed between the pleats. This filter material is a band-shaped spacer with a corrugated section, a coil,
A spacer such as a spacer or a comb tooth was interposed therebetween, and the interval between the pleats was maintained at a predetermined interval by the spacer even by the pressure of the fluid.

However, in this filter material,
In addition to the pleating process, a step of interposing a spacer between the pleats was required, and the production was troublesome and the cost was high. Further, there is a problem that the weight is increased because a separate member called a spacer is attached.

[0007] Another filter material is disclosed in
There is one described in JP-A-43307. As shown in FIG. 7, the filter material 11 is provided with a number of pleat fold lines 12 on the filter paper in the vertical, horizontal, and diagonal directions, and is bent along the pleat fold lines 12 to provide a three-dimensional undulation. It is a structure, and the close contact between the pleats is prevented by the three-dimensional obstacle created in the structure. However, this filter material
It is necessary to provide a number of complicated pleated fold lines on the filter paper, and to fold the fold lines accurately in order along the fold line, and the processing requires a lot of labor and time.

[0008]

The problem to be solved by the present invention is that the pleats adhere to each other due to the pressure of the fluid to be treated, thereby deteriorating the filter function, and a spacer is interposed to maintain the interval between the pleats. Let me
This is a point that requires complicated operations such as forming complicated pleats. The present invention has been made in view of such a problem, and an object of the present invention is to provide a filter material having a simple and stable structure in which an interval between pleats is maintained.

[0009]

In order to achieve the above object, the invention according to claim 1 is characterized in that the 5% modulus is 2%.
0 kg / 5 cm width or less, and the softness is 100 to 160
It consists a 0mgf nonwoven, for a predetermined in the nonwoven fabric
The gist is a filter material characterized by being pleated by a continuous annular pleated line provided at a distance.

Hereinafter, the filter material of the present invention will be described in more detail. The nonwoven fabric used as the filter material of the present invention has a 5% modulus of 20 kg / 5 cm or less,
Bending resistance is Ru 100~1600mgf der. The degree of elongation and the degree of softness maintain rigidity enough to maintain the pleated shape and maintain the interval between the pleats, and elongation enough to absorb the distortion generated during bending during pleating. It is shown.

The 5% modulus in the present invention is defined by JIS
L-1096 is a numerical value obtained by a method mutatis mutandis applying the test method specified in 6.12. That is, the 5% modulus means that a 5 cm-wide strip-shaped test piece is attached to a tensile tester so that the distance between the chucks is 200 mm, and the test piece is pulled up and down at a speed of 200 mm / min. Is the measured value of the stress required to elongate by 5%. still,
The tensile direction of the test piece is 2 in the vertical direction and the horizontal direction of the nonwoven fabric.
It is made to be a kind. The smaller the value of the 5% modulus is, the smaller the force is, and the smaller the value is, the easier the strain is to be absorbed.

[0012] In the filter material of the present invention, when the 5% modulus of the nonwoven fabric is larger than 20 kg / 5 cm width, the strain generated when the nonwoven fabric is folded along the pleated fold line is not sufficiently absorbed, and unnecessary portions are not absorbed. Therefore, there is a possibility that a so-called corner may be generated and a pleat of a predetermined shape may not be obtained.

On the other hand, the rigidity referred to in the present invention is defined by JIS.
L-1086 Refers to numerical values determined by a method mutatis mutandis applying the test method specified in 6.13. That is, the softness is
Using a Gurley tester, 30 mm x 40
This is a numerical value obtained by measuring the stiffness of a mm test piece (two types of test pieces: a vertical direction and a horizontal direction of the nonwoven fabric). The larger the value of the softness is, the more difficult it is to bend, which means that it is less susceptible to deformation due to external force, and that it has excellent shape retention. In the filter material of the present invention, when the bristles are less than 100 mgf, the pleated shape may easily collapse after pleating, and sufficient shape retention may not be obtained. In addition, if the rigidity is too large, it will be difficult to pleat,
The bristles should not exceed 1600 mgf .

When used as a filter material, only one nonwoven fabric may be used, but two or more nonwoven fabrics may be laminated. Also, a laminate obtained by combining various kinds of nonwoven fabrics such as a nonwoven fabric obtained by laminating a binder-bonded nonwoven fabric and a melt-blown nonwoven fabric may be used. Also, the nonwoven fabric is impregnated with a resin such as an ethylene-vinyl chloride copolymer, an ethylene-vinyl chloride-vinyl acetate copolymer, a vinyl chloride resin, an acrylic resin, or the like to measure the reinforcement of the folded shape after pleating, An electret treatment for collecting dust by electrostatic force may be performed. Pleating is performed on such a nonwoven fabric to form a continuous annular pleated shape.

As shown in FIG. 2, the pleating process is performed at a predetermined interval with a continuous annular pressing die 23.
By pressing the nonwoven fabric X, Tokoro to the nonwoven fabric X
At intervals of a constant folding line 22 provided pleats, etc. along fold line 22 this will bend the nonwoven fabric X alternately, it can be used with conventionally known processing methods. The press by the pressing die 23 may be a hot press.

The pleated fold line 22 is shown in FIGS.
3 may be used, but distortion is likely to occur at the time of bending. Therefore, a lens-shaped object in which the fold line 22 is formed by the gentle curve shown in FIG. desirable. Further, the shape of the ring forming the pleated fold line 22 is short in horizontal width and long in vertical length, that is, the longer the pleated fold line 22 is provided in the direction in which the ring is continuous, the smaller the distortion becomes. However, if the width is too short and the width is too long, it becomes linear, and when it is bent, the pleats 2 as shown in FIG.
The folded shape of the pleat 24 is not three-dimensional, and the obstacle to maintain the interval between the pleats 24 due to the three-dimensional structure of the pleats 24 is eliminated.

As shown in FIGS. 3 and 4, a ridge portion (a portion located at the center of the ring) and a valley portion (a portion located at the end of the ring) of adjacent pleat fold lines meet. As described above, when the folding lines are provided with a shifted period, the occurrence of distortion at the time of bending is smaller than that in the case of FIG. In the case of FIGS. 3 and 4,
Since the dotted line portions are overlapped at the time of bending, for example, as shown in FIG. 5, by joining them with a heat seal or an adhesive, the shape retention of the filter material can be improved. By performing such a joining process, it is possible to omit the side plates and reinforcing tapes used for stabilizing the shape of the pleated filter material, thereby reducing the weight of the filter and reducing the processing cost. Can be.

As described above, the pleated filter material 21 is, as shown in FIG.
1 has a three-dimensional structure in which a continuous annular (lens-like, diamond-like, etc.) surface is formed on the upstream side and the downstream side, and this becomes an obstacle to prevent the pleats 24 from adhering to each other.
The mutual interval is maintained at a predetermined interval.

The filter material according to the present invention can be used for both fluids for gas and liquid, but is particularly useful for filtering gas.

[0020]

EXAMPLE 1 A fibrous web composed of 50% polychloral fiber and 50% polyester fiber was impregnated with an emulsion mainly composed of an ethylene-vinyl chloride-vinyl acetate copolymer, and then dried to obtain a basis weight of 70 g / g. preparing a binder-adhesive nonwoven m ^2. Next, 10 g / m ² of polyethylene resin powder is sprayed on the binder-bonded non-woven fabric, and then polypropylene fine fibers are accumulated thereon by a melt-blowing method, followed by thermocompression bonding to produce a melt-blown non-woven fabric having a basis weight of 20 g / m ^2. Then, the meltblown nonwoven fabric and the binder-bonded nonwoven fabric were laminated to each other, and the basis weight was 100 g /
making m ² nonwoven. Further, the nonwoven fabric was subjected to an electret treatment by corona charging to obtain a nonwoven fabric X to be pleated. The non-woven fabric X had a 5% modulus of 13.7 kg in length / 5 cm in width and 5.7 kg in width.
5cm width, bristles are vertical 569mgf, width 22
It was 6 mgf. A continuous diamond-shaped pleated fold line 22 was formed on the nonwoven fabric X by pressing with a continuous diamond-shaped pressing die 23 shown in FIG.
Next, the non-woven fabric X is alternately folded in the opposite direction along the folding line 22 so that the filter material 21 is formed.
I got

Example 2 A fibrous web composed of 50% polychloral fiber and 50% polyester fiber was impregnated with an emulsion mainly composed of an ethylene-vinyl chloride-vinyl acetate copolymer, dried, and dried to a weight of 55 g / m2. The binder-bonded nonwoven fabric of No. ² is prepared. Next, 10 g / m ² of polyethylene resin powder is sprayed on the binder-bonded non-woven fabric, and then polypropylene fine fibers are accumulated thereon by a melt blow method, and the melt-blown non-woven fabric having a basis weight of 25 g / m ^{2 is formed} by thermocompression bonding. Produced and laminated with the melt blown nonwoven fabric and the binder-bonded nonwoven fabric, with a basis weight of 90 g /
making m ² nonwoven. Further, the nonwoven fabric was subjected to an electret treatment by corona charging to obtain a nonwoven fabric X to be pleated. The 5% modulus of the nonwoven fabric X was 11.8 kg / 5 cm wide, 3.9 kg / width.
5cm width, vertical and rigidity is 429mgf vertical, 15 horizontal
It was 0 mgf. This nonwoven fabric X was pleated in the same manner as in Example 1 to obtain a filter material 21.

Example 3 A fibrous web composed of 50% polychloral fiber and 50% polyester fiber was impregnated with an emulsion mainly composed of an ethylene-vinyl chloride-vinyl acetate copolymer, dried, and dried to a weight of 100 g / m2. The binder-bonded nonwoven fabric of No. ² is prepared. Next, on the binder-bonded nonwoven fabric,
After spraying polyethylene resin powder 10 g / m ² , polypropylene fine fibers are accumulated thereon by a melt blow method and thermocompression-bonded to produce a melt blown nonwoven fabric having a basis weight of 40 g / m ^2. With a basis weight of 150
A nonwoven fabric of g / m ² is prepared. Further, the nonwoven fabric was subjected to an electret treatment by corona charging to obtain a nonwoven fabric X to be pleated. The 5% modulus of the nonwoven fabric X is 17.5 kg in length / 5 cm wide and 7.5 k in width.
g / 5 cm width, and the bristles were 1239 mgf in length and 920 mgf in width. This nonwoven fabric X was pleated in the same manner as in Example 1 to obtain a filter material 21.

The filter material 21 thus obtained
In FIG. 1, as shown in FIG. 1, the interval between the pleats 24 is maintained by the three-dimensional folded shape of the pleats 24, and the pleats 24 have no sharp edges and have sharply folded pleats 24. Had become. Further, the folded shape of the pleats 24 was kept in a stable state.

[0024]

According to the present invention, the filter material of the present invention has a three-dimensional structure in which a continuous annular surface is formed on the upstream and downstream sides of the filter material. Therefore, this becomes an obstacle to prevent the pleats from contacting each other, and the interval between the pleats is maintained. For this reason, the pleats do not adhere to each other due to the pressure of the fluid to be processed passing through the filter material, and the filter function does not deteriorate. In addition, this filter material does not require a complicated process such as processing by providing a conventional complicated folding line or interposing a spacer,
Simply an annular row on the nonwoven pleated fold line a predetermined
Along the annular pleated line
It is only necessary to bend alternately, and processing can be performed extremely easily.

In this filter material, the 5% modulus is not more than 20 kg / 5 cm width, and the softness is 1%.
Because it is made of a nonwoven fabric of 100 to 1600 mgf,
Distortion hardly occurs when the pleats are bent, sharp pleats can be formed, and the pleats can be kept in a stable state.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a filter material of the present invention.

FIG. 2 is a perspective view illustrating a state in which a pleated fold line is provided on the nonwoven fabric.

FIG. 3 is a plan view showing another example of the pleat fold line.

FIG. 4 is a plan view showing still another example of the pleat fold line.

FIG. 5 is a perspective view showing a joined filter material.

FIG. 6 is a perspective view showing a conventional filter material.

FIG. 7 is a perspective view showing still another conventional filter material.

[Explanation of symbols]

 21: Filter material 22: Pleated fold line 24: Pleated X: Non-woven fabric

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B01D 46/52 B01D 39/16

Claims (1)

(57) [Scope of request for utility model registration] 1. A 5% modulus is 20 kg / 5 cm width or less.
A non-woven fabric having a stiffness of 100 to 1600 mgf, which is pleated by a continuous annular pleated line provided at a predetermined interval on the non-woven fabric. Filter material characterized by having.